Sensitized plate for photographic cameras.



,242- PATENTED JAN. 13, 1903.'

A. A. BROOKS L G. A. WATSON. SBNSITIZED PLATE POR PHOTOGRAPHIO CAMERAS.

AI-PLICATION FILED APR. 24', 1901.

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STATES PATENT Grrron.

ARTHUR AUGUSTUS BROOKS AND GEORGE ANDREW WATSON, OF

LIVERPOOL, ENGLAND.

SENSITIZED PLATE FOR-PHOTOGRAPHIC CANIKERAS.

SPECIFICATION forming' part of Letters Patent No. 718,242, dated January 13, 1903. Application filed April 24, 1901. Serial No. 57,276. (No model.)

T0 1J/Z whom, it pta/y concer-1e.-

Beit known thatvwe, ARTHUR AUGUSTUS BROOKS and GEORGE ANDREW WATsoN, subjects of the King of Great Britain and Ireland, and residents of Liverpool, in the county of Lancaster, England, have invented certain new and useful Improvements in Sensitized Plates for Photographic Cameras, of which the following is a specification.

This invention relates to sensitized plates or films for photographic cameras fitted with plate-changing devices and changeable-plate cases; and it consists in the special treatment of the edges and margins of the films, with the object of facilitating their transference from the plate-case to the exposureframe and back again.

The invention has special reference to the novel form of combined magazine plateholder and exposure-frame which forms the subject of our copending application, Serial No. 57,277, of even date herewith and wherein a changeable plate or film case is contained within the exposure-frame and the plates or films are successively taken from the case, exposed, and returned thereto by mechanism described in said application.

Theannexed sheet of drawings illustrates our improved plate.

Figure l represents a plan of one plate; Fig. 2, a plan of the lower part of another plate; and Fig. 3, several superposed plates in section upon an exaggerated scale, showing the manner in which they are assembled in the camera or plate-holder to be dealt with.

The plates are preferably made of celluloid coated with sensitized gelatinor of glass similarly prepared. They are rounded at the top corners o. ct to facilitate their entry into a plate-case from the Lbottom end thereof and have notches b cut into their external edges for the purpose of engaging with corresponding projections on the inside of the case for the purpose of retaining the plates in the plate-case while it is open at the bottom.

Each plate is further perforated near-to thebottom edge with a hole c, placed to one side of the center line of the plate for the purpose of affording a hold to a pin employed for drawing the plate out of the plate-case. One half of the plates to be inserted into the platecase have these holes placed to the right of the center line and the other half have them placed to the left thereof, looking in each case'at the sensitized side of the plate and assuming an even number of plates are assembled, and they are packed into the platecase so as to have 'said holes alternately to the right and left, as shown in partial section by Fig. 3, in order to prevent the pin employed for drawing them out of the platecase from seizing more than one plate at a time. insertion of the plate into the plate-case after exposure the top edge of the plate d/ is preferably hollowed out.

We claim as our inventionl. As an article of manufacture, a sensitized plate for use in a camera fitted with a `plate-changing device, having rounded top corners a, a, a notch b in each lateral edge and a hole c near to the bottom edge and to one side of the center line of the plate, as and for the purposes described.

2. As an article of manufacture, a sensitized plate for use in a camera fitted with a plate-changing-device, having rounded top corners a, a concave top edge a, a notch b, in each lateral edge and a hole c near to the bottom edge and to one side of the center `line of the plate.

3. As au article of manufacture, a sensitized plate or iilm having a rounded upper corner and a notch in a lateral edge,whereby the plate is held springingly in a plate-case formed to fit it, and to facilitate the With- ARTHUR AUGUSTUS BROOKS. GEORGE ANDREW WATSON.

Witnesses:

P. H. MoTT, R. J. URQUHART.

For the purpose of facilitating the re- 

